Space angle measuring device for repairing squint window of low-pressure cylinder of steam turbine and measuring method of space angle measuring device

Abstract

The invention discloses a space angle measuring device for repairing a squint window of a low-pressure cylinder of a steam turbine and a measuring method thereof, and particularly relates to the technical field of steam turbine repairing. The problems that when an existing turbine low-pressure cylinder peep window returns to a factory for maintenance, due to cylinder deformation, the actual space angle does not accord with a drawing, the current space angle is difficult to measure, and accurate machining cannot be conducted are solved. The measuring device comprises a base, a measuring sleeve, a mandrel, a rotating shaft and a gravity pointer, the mandrel is fixedly installed on the base, the measuring sleeve is installed on the outer side of the mandrel in a sleeving mode and can rotate in the circumferential direction of the mandrel, and the gravity pointer is arranged below the middle of the outer side of the measuring sleeve through the rotating shaft and can rotate in the circumferential direction of the rotating shaft. The method is used for repairing the turbine low-pressure cylinder squint window.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbine repair, and in particular to a spatial angle measuring device and a measuring method thereof for repairing a peep window of a low-pressure cylinder of a steam turbine. Background Art

[0002] After a period of operation, the steam turbine unit needs to be returned to the factory for overhaul. The low-pressure cylinder peep window flange is usually produced for the first time on a small milling machine. After the steel plate is milled, grooved and drilled according to the size of the peep window drawing, it is welded to the opening of the low-pressure cylinder wall. When the low-pressure cylinder is returned to the factory for overhaul, the inclined surface needs to be reprocessed according to the spatial angle. If the peep window is gas cut to remove and then repaired and welded, it will be time-consuming and laborious. If the repair is done in the current state, the cylinder will deform due to welding angle errors and high temperature and high pressure operation, and the spatial angle will not match the drawing. It is difficult to measure the current spatial angle and cannot be accurately processed. Summary of the invention

[0003] In order to solve the problem that when a steam turbine low-pressure cylinder peep window is returned to the factory for repair, the actual spatial angle does not match the drawing due to cylinder deformation, making it difficult to measure the current spatial angle and unable to perform accurate processing, the present invention further provides a spatial angle measuring device and a measuring method for repairing a steam turbine low-pressure cylinder peep window.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] A spatial angle measuring device for repairing a low-pressure cylinder peep window of a steam turbine comprises a base, a measuring sleeve, a core shaft, a rotating shaft and a gravity pointer. The core shaft is fixedly mounted on the base, the measuring sleeve is sleeved on the outer side of the core shaft and can rotate along the circumferential direction of the core shaft, and the gravity pointer is arranged below the middle part of the outer side of the measuring sleeve through the rotating shaft, and the gravity pointer can rotate along the circumferential direction of the rotating shaft.

[0006] Furthermore, the base includes a positioning plate, a bottom plate and two connecting plates. The positioning plate cooperates with the square groove of the low-pressure cylinder peep window. The bottom plate is horizontally fixed to the upper end surface of the positioning plate. The two connecting plates are arranged opposite to each other and vertically fixed to the upper end surface of the bottom plate. The core shaft is horizontally fixed to the upper part between the two connecting plates.

[0007] Furthermore, a plurality of positioning through holes are provided on the bottom plate, and the positioning through holes are arranged in one-to-one correspondence with the screw holes of the low-pressure cylinder peep window, and the positioning through holes and the screw holes of the low-pressure cylinder peep window are connected by positioning bolts.

[0008] Furthermore, a connecting through hole is opened at the upper end of the connecting plate, an optical axis segment is provided at the end of the core shaft, the optical axis segment is inserted into the connecting through hole, a threaded segment is provided at the outer end of the core shaft, the threaded segment is arranged on the outer side of the connecting plate, a connecting nut is threadedly connected to the threaded segment, and the core shaft is fixed to the connecting plate through the connecting nut.

[0009] Furthermore, a 360° circular angle scale line is provided on the outer side of the connecting through hole on the connecting plate along the circumferential direction.

[0010] Furthermore, the measuring sleeve includes a scale disk, a sleeve and a connecting plate. The sleeve is sleeved on the outside of the middle part of the core shaft and is arranged between two connecting plates. The sleeve and the core shaft are rotatably connected. The connecting plate is vertically fixed to the middle part of the outer side wall of the sleeve. The scale disk is coaxially fixed to the end of the sleeve. A rotating through hole is opened in the middle part of the lower end of the connecting plate. The rotating shaft is inserted into the rotating through hole. The middle part of the gravity pointer is sleeved on the rotating shaft.

[0011] Furthermore, a cross scale line is provided on the end surface of the scale disk and is arranged on the inner side of the 360° circular angle scale line on the connecting plate.

[0012] Furthermore, a 360° circular angle scale line is provided along the circumferential direction on the outer side of the rotating through hole on the connecting plate.

[0013] Furthermore, the middle part of the rotating shaft passes through the connecting plate, the middle part of the gravity pointer is mounted on the front end of the rotating shaft, both ends of the rotating shaft are threadedly connected with fastening nuts, the rotating shaft is fixed to the connecting plate through the fastening nuts, and the gravity pointer is rotationally connected to the rotating shaft.

[0014] A measuring method of a space angle measuring device for repairing a peep window of a steam turbine low-pressure cylinder comprises the following steps:

[0015] Step 1, determine the angle: the peep window space plane of the low-pressure cylinder is decomposed into the angle β between the peep window slot axis and the horizontal median plane of the low-pressure cylinder and the angle α between the peep window slot axis and the vertical plane of the low-pressure cylinder;

[0016] Step 2: Install the measuring device: Place the low-pressure cylinder on the workbench, assemble the measuring device, add lubricating oil between the measuring sleeve and the mandrel and between the gravity pointer and the rotating shaft, then put the positioning plate of the measuring device into the square groove of the low-pressure cylinder peep window, and fix the measuring device on the low-pressure cylinder peep window with the positioning bolts;

[0017] Step 3, measure the angle α: Due to the effect of gravity, the center line of the connecting plate of the measuring sleeve rotates from the original parallel to the center line of the connecting plate by an angle, which can be measured by the change of the cross scale line on the end face of the scale disk and the 360° circular angle scale line on the connecting plate. This angle is the angle α between the axis of the peep window slot and the vertical plane of the low-pressure cylinder;

[0018] Step 4, measure the angle β: Due to the effect of gravity, the center line of the gravity pointer rotates by an angle from being parallel to the center line of the connecting plate. This angle can be measured by the change of the 360° circular angle scale line between the gravity pointer and the connecting plate. This angle is the angle β between the axis of the peep window slot and the horizontal midplane of the low-pressure cylinder;

[0019] Step 5: Determine the spatial angle of the peep window by measuring the angle α and the angle β.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The measuring device of the present invention can measure the spatial angle of the low-pressure cylinder peep window flange. According to the measured spatial angle, the peep window plane can be processed by rotating the spatial angle through a program to complete the repair, which can be completed in half a day. The measurement method works very well in actual processing. The solution solves the processing difficulties, improves production efficiency, ensures the flatness of the repair plane, ensures the processing quality, and guarantees the assembly of the peep cover, providing a new solution for future spatial plane repair tasks. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the main structure of a space angle measuring device for repairing a peep window of a steam turbine low-pressure cylinder in the present invention;

[0023] Figure 2 It is a left-view structural schematic diagram of a space angle measuring device for repairing a low-pressure cylinder peep window of a steam turbine in the present invention;

[0024] Figure 3 It is a schematic diagram of the top view structure of a space angle measuring device for repairing a peep window of a steam turbine low-pressure cylinder in the present invention;

[0025] Figure 4 It is a schematic diagram of the upward structure of a space angle measuring device for repairing a peep window of a steam turbine low-pressure cylinder in the present invention;

[0026] Figure 5 yes Figure 1 AA section diagram in FIG.

[0027] Figure 6 It is a schematic diagram of the axonometric structure of a space angle measuring device for repairing a low-pressure cylinder peep window of a steam turbine in the present invention;

[0028] Figure 7 It is the angle position diagram of the main viewing direction of the low-pressure cylinder peep window;

[0029] Figure 8 yes Figure 7 HH section direction angle position diagram;

[0030] Fig. 9 It is a schematic diagram of the installation of a spatial angle measuring device for repairing a peep window of a steam turbine low-pressure cylinder in the present invention;

[0031] Fig.10 yes Fig. 9 The enlarged view of F in the figure;

[0032] Fig.11 yes Fig.10 Schematic diagram of the KK section. DETAILED DESCRIPTION

[0033] Specific implementation method 1: Combination Figures 1 to 6 The present embodiment is described as follows: a spatial angle measuring device for repairing a peep window of a low-pressure cylinder of a steam turbine comprises a base 1, a measuring sleeve 2, a core shaft 3, a rotating shaft 4 and a gravity pointer 5. The core shaft 3 is fixedly mounted on the base 1, the measuring sleeve 2 is sleeved on the outer side of the core shaft 3 and can rotate along the circumferential direction of the core shaft 3, the gravity pointer 5 is arranged below the middle part of the outer side of the measuring sleeve 2 through the rotating shaft 4, and the gravity pointer 5 can rotate along the circumferential direction of the rotating shaft 4.

[0034] The gravity pointer 5 can rotate freely along the circumferential direction of the rotating shaft 4. The spatial angle of the flange of the low-pressure cylinder peep window can be measured by the above device. According to the measured spatial angle, the peep window plane can be processed by rotating the spatial angle through the program to complete the repair, which can be completed in half a day.

[0035] Specific implementation method 2: Combination Figures 1 to 6 This embodiment is described. The base 1 described in this embodiment includes a positioning plate 1-1, a bottom plate 1-2 and two connecting plates 1-3. The positioning plate 1-1 matches the square groove of the low-pressure cylinder peep window. The bottom plate 1-2 is horizontally fixed to the upper end surface of the positioning plate 1-1. The two connecting plates 1-3 are arranged oppositely and vertically fixed to the upper end surface of the bottom plate 1-2. The core shaft 3 is horizontally fixed to the upper part between the two connecting plates 1-3. The undisclosed technical features in this embodiment are the same as those in the specific embodiment 1.

[0036] Specific implementation method three: Combination Figures 1 to 6 To explain this embodiment, a plurality of positioning through holes 1-2-1 are provided on the bottom plate 1-2 of this embodiment, and the positioning through holes 1-2-1 are arranged one-to-one with the screw holes of the low-pressure cylinder peep window, and the positioning through holes 1-2-1 are connected with the screw holes of the low-pressure cylinder peep window by positioning bolts 7. The undisclosed technical features in this embodiment are the same as those in the second specific embodiment.

[0037] Specific implementation method four: Combination Figures 1 to 6 This embodiment is described. A connecting through hole is provided at the upper end of the connecting plate 1-3 in this embodiment. An optical axis section is provided at the end of the core shaft 3. The optical axis section is inserted into the connecting through hole. A threaded section is provided at the outer end of the core shaft 3. The threaded section is arranged on the outer side of the connecting plate 1-3. A connecting nut 6 is threadedly connected to the threaded section. The core shaft 3 is fixedly connected to the connecting plate 1-3 through the connecting nut 6. The technical features not disclosed in this embodiment are the same as those in the second specific embodiment.

[0038] Specific implementation method five: Combination Figures 1 to 6To explain this embodiment, the outer side of the connecting through hole on the connecting plate 1-3 described in this embodiment is provided with 360° circumferential angle scale lines along the circumferential direction. The undisclosed technical features in this embodiment are the same as those in the fourth embodiment.

[0039] The upper end of the connecting plate 1-3 is arc-shaped.

[0040] Specific implementation method six: Combination Figures 1 to 6 This embodiment is described. The measuring sleeve 2 in this embodiment includes a graduated disc 2-1, a sleeve 2-2 and a connecting plate 2-3. The sleeve 2-2 is sleeved on the outside of the middle of the mandrel 3 and is arranged between two connecting plates 1-3. The sleeve 2-2 is rotatably connected to the mandrel 3. The connecting plate 2-3 is vertically fixed to the middle of the outer wall of the sleeve 2-2. The graduated disc 2-1 is coaxially fixed to the end of the sleeve 2-2. A rotating through hole is opened in the middle of the lower end of the connecting plate 2-3. The rotating shaft 4 is inserted into the rotating through hole. The middle of the gravity pointer 5 is sleeved on the rotating shaft 4. The undisclosed technical features in this embodiment are the same as those in the specific embodiment 5.

[0041] Specific implementation method seven: Combination Figures 1 to 6 To explain this embodiment, the end surface of the scale disk 2-1 in this embodiment is provided with a cross scale line and is arranged inside the 360° circular angle scale line on the connecting plate 1-3. The undisclosed technical features in this embodiment are the same as those in the sixth embodiment.

[0042] Specific implementation method eight: Combination Figures 1 to 6 To explain this embodiment, the outer side of the rotating through hole on the connecting plate 2-3 in this embodiment is provided with 360° circumferential angle scale lines along the circumferential direction. The undisclosed technical features in this embodiment are the same as those in the sixth embodiment.

[0043] Specific implementation method nine: Combination Figures 1 to 6 To explain this embodiment, the middle part of the rotating shaft 4 in this embodiment passes through the connecting plate 2-3, the middle part of the gravity pointer 5 is sleeved on the front end of the rotating shaft 4, both ends of the rotating shaft 4 are threadedly connected with fastening nuts 8, the rotating shaft 4 is fixedly connected to the connecting plate 2-3 through the fastening nuts 8, and the gravity pointer 5 is rotatably connected to the rotating shaft 4. The undisclosed technical features in this embodiment are the same as those in the specific embodiment 6.

[0044] The lower end of the connecting plate 2-3 is arc-shaped.

[0045] Specific implementation method ten: Combination Figures 1 to 11 This embodiment is described. This embodiment is based on a measurement method of a spatial angle measurement device for repairing a peep window of a steam turbine low-pressure cylinder. The method comprises the following steps:

[0046] Step 1, determine the angle: the spatial plane of the peep window of the low-pressure cylinder is decomposed into the angle β between the axis of the peep window groove and the horizontal median plane of the low-pressure cylinder and the angle α between the axis of the peep window groove and the vertical plane of the low-pressure cylinder in the section of angle β;

[0047] Step 2: Install the measuring device: Place the low-pressure cylinder on the workbench, assemble the measuring device, add lubricating oil between the measuring sleeve 2 and the core shaft 3 and between the gravity pointer 5 and the rotating shaft 4, then put the positioning plate 1-1 of the measuring device into the square groove of the low-pressure cylinder peep window, and fix the measuring device on the low-pressure cylinder peep window with the positioning bolt 7;

[0048] Step 3, measuring the angle α: Due to the effect of gravity, the center line of the connecting plate 2-3 of the measuring sleeve 2 is rotated by an angle from being parallel to the center line of the connecting plate 1-3. The angle can be measured by the cross scale line on the end face of the scale disk 2-1 and the 360° circular angle scale line on the connecting plate 1-3. This angle is the angle α between the axis of the peep window groove and the vertical plane of the low-pressure cylinder;

[0049] Step 4, measure the angle β: Due to the effect of gravity, the center line of the gravity pointer 5 rotates from being parallel to the center line of the connecting plate 2-3 by an angle, which can be measured by the change of the 360° circular angle scale line between the gravity pointer 5 and the connecting plate 2-3. This angle is the angle β between the axis of the peep window slot and the horizontal mid-plane of the low-pressure cylinder;

[0050] Step 5: Determine the spatial angle of the peep window by measuring the angle α and the angle β.

[0051] The spatial plane of the peep window of the low-pressure cylinder can be decomposed into the angle β between the axis of the peep window slot in the main view plane and the horizontal median plane of the low-pressure cylinder (such as Figure 7 ), and the angle α between the axis of the window slot in the HH section and the vertical plane of the low-pressure cylinder (vertical plane) (such as Figure 8 ). Place the low-pressure cylinder on the workbench, assemble the measuring device 9, fix the measuring device 9 on the low-pressure cylinder peep window by the positioning bolt 7, measure the angle α and the angle β by the measuring device 9, and finally determine the spatial angle of the peep window by the measured angle α and the angle β. According to the measured spatial angle, the peep window plane can be processed by rotating the spatial angle through the program to complete the repair.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A spatial angle measuring device for repairing a low-pressure cylinder peep window of a steam turbine, characterized in that: The invention comprises a base (1), a measuring sleeve (2), a core shaft (3), a rotating shaft (4) and a gravity pointer (5), wherein the core shaft (3) is fixedly mounted on the base (1), the measuring sleeve (2) is sleeved on the outer side of the core shaft (3) and can rotate along the circumferential direction of the core shaft (3), and the gravity pointer (5) is arranged below the middle part of the outer side of the measuring sleeve (2) through the rotating shaft (4), and the gravity pointer (5) can rotate along the circumferential direction of the rotating shaft (4).

2. A spatial angle measuring device for repairing a low-pressure cylinder peep window of a steam turbine according to claim 1, characterized in that: The base (1) comprises a positioning plate (1-1), a bottom plate (1-2) and two connecting plates (1-3); the positioning plate (1-1) matches the square groove of the low-pressure cylinder peep window; the bottom plate (1-2) is horizontally fixed to the upper end surface of the positioning plate (1-1); the two connecting plates (1-3) are arranged opposite to each other and vertically fixed to the upper end surface of the bottom plate (1-2); and the core shaft (3) is horizontally fixed to the upper part between the two connecting plates (1-3).

3. The spatial angle measuring device for repairing the low-pressure cylinder peep window of a steam turbine according to claim 2, characterized in that: The bottom plate (1-2) is provided with a plurality of positioning through holes (1-2-1), the positioning through holes (1-2-1) and the screw holes of the low-pressure cylinder peep window are arranged in one-to-one correspondence, and the positioning through holes (1-2-1) and the screw holes of the low-pressure cylinder peep window are connected via positioning bolts (7).

4. The spatial angle measuring device for repairing the low-pressure cylinder peep window of a steam turbine according to claim 2, characterized in that: The upper end of the connecting plate (1-3) is provided with a connecting through hole, the end of the core shaft (3) is provided with an optical axis section, the optical axis section is inserted into the connecting through hole, the outer end of the core shaft (3) is provided with a threaded section, the threaded section is arranged on the outer side of the connecting plate (1-3), a connecting nut (6) is threadedly connected to the threaded section, and the core shaft (3) is fixedly connected to the connecting plate (1-3) through the connecting nut (6).

5. The spatial angle measuring device for repairing the low-pressure cylinder peep window of a steam turbine according to claim 4, characterized in that: The outer side of the connecting through hole on the connecting plate (1-3) is provided with 360° circumferential angle scale lines along the circumferential direction.

6. The spatial angle measuring device for repairing the peep window of a steam turbine low-pressure cylinder according to claim 5, characterized in that: The measuring sleeve (2) comprises a graduated disc (2-1), a sleeve (2-2) and a connecting plate (2-3); the sleeve (2-2) is sleeved on the outside of the middle of the core shaft (3) and is arranged between two connecting plates (1-3); the sleeve (2-2) and the core shaft (3) are rotatably connected; the connecting plate (2-3) is vertically fixed to the middle of the outer wall of the sleeve (2-2); the graduated disc (2-1) is coaxially fixed to the end of the sleeve (2-2); a rotating through hole is opened in the middle of the lower end of the connecting plate (2-3); a rotating shaft (4) is inserted into the rotating through hole; and the middle of the gravity pointer (5) is sleeved on the rotating shaft (4).

7. The spatial angle measuring device for repairing the low-pressure cylinder peep window of a steam turbine according to claim 6, characterized in that: The end surface of the graduated disk (2-1) is provided with a cross scale line and is arranged on the inner side of the 360° circumferential angle scale line on the connecting plate (1-3).

8. The spatial angle measuring device for repairing the peep window of a steam turbine low-pressure cylinder according to claim 6 is characterized in that: The outer side of the rotating through hole on the connecting plate (2-3) is provided with 360° circular angle scale lines along the circumferential direction.

9. The spatial angle measuring device for repairing a peep window of a steam turbine low-pressure cylinder according to claim 6, characterized in that: The middle part of the rotating shaft (4) passes through the connecting plate (2-3), the middle part of the gravity pointer (5) is sleeved on the front end of the rotating shaft (4), both ends of the rotating shaft (4) are threadedly connected with fastening nuts (8), the rotating shaft (4) is fixedly connected to the connecting plate (2-3) through the fastening nuts (8), and the gravity pointer (5) is rotatably connected to the rotating shaft (4).

10. A measuring method for a spatial angle measuring device for repairing a peep window of a steam turbine low-pressure cylinder according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: Step 1, determine the angle: the peep window space plane of the low-pressure cylinder is decomposed into the angle β between the peep window slot axis and the horizontal median plane of the low-pressure cylinder and the angle α between the peep window slot axis and the vertical plane of the low-pressure cylinder; Step 2: Install the measuring device: Place the low-pressure cylinder on the workbench, assemble the measuring device, add lubricating oil between the measuring sleeve (2) and the core shaft (3) and between the gravity pointer (5) and the rotating shaft (4), then put the positioning plate (1-1) of the measuring device into the square groove of the low-pressure cylinder peep window, and fix the measuring device on the low-pressure cylinder peep window by the positioning bolt (7); Step 3, measuring the angle α: Due to the effect of gravity, the center line of the connecting plate (2-3) of the measuring sleeve (2) rotates by an angle from being parallel to the center line of the connecting plate (1-3) originally, which can be measured by the change of the cross scale line on the end face of the scale disk (2-1) and the 360° circular angle scale line on the connecting plate (1-3). This angle is the angle α between the axis of the peep window groove and the vertical plane of the low-pressure cylinder; Step 4, measuring the angle β: Due to the effect of gravity, the center line of the gravity pointer (5) rotates by an angle from being parallel to the center line of the connecting plate (2-3) originally, which can be measured by the change of the 360° circular angle scale lines on the gravity pointer (5) and the connecting plate (2-3). This angle is the angle β between the axis of the peep window slot and the horizontal midplane of the low-pressure cylinder; Step 5: Determine the spatial angle of the peep window by measuring the angle α and the angle β.

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